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Home >> GMC >> 1983 >> S15 Jimmy 1.9 A, 4WD, MB6 >> Repair and Diagnosis >> Engine Performance >> System >> Vacuum Advance Spark Control System >> Description >> Spark Vacuum Delay

Spark Vacuum Delay

The spark vacuum delay is used on 5.7L V8 engines with Heavy Duty Emissions. It is installed between TVS check valve and distributor.

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